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Configuring PPP Services
2-8 114068 Rev. A
One-Way Authentication
One-way authentication uses an authentication protocol on only one side of a
dial-up connection. The router placing the call disables the authentication protocol
for a circuit, while the router on the receiving side enables authentication.
Disabling the outbound authentication lets the router interoperate with other
devices that may not allow two-way authentication or support CHAP.
The receiving router can use both PAP and CHAP in the same line pool. When the
router receives a call, it authenticates using the user-configured protocol. If the
calling router rejects the authentication protocol CHAP, the receiving router
switches to PAP.
One-way authenticationrequires that PAP and CHAP be enabled in the same line
pool. Set the PPP Local Authentication Protocol parameter to CHAP and enable
PAP Fallback. You must also configure certain options for the switched circuit
itself. See Configuring Dial Services for a description of how you must set up dial
services to enable one-way authentication.
Negotiating Network Layer Protocols
PPP uses various network control protocols to determine the values of parameters
during network layer negotiations, the final phase of PPP initialization. Like the
LCP, each network control protocol allows peer routers to negotiate various
network options over the data link by transmitting Configure-Request,
Configure-ACK, Configure-NAK, and Configure-Reject packets.
Network options include which network addresses to use and which media types
to bridge. Once both peer routers agree upon network options, the network control
protocol reaches the open state. The routers then begin transmitting user data
packets for any upper-layer protocols over the link.
Datagram Encapsulation
Before transmitting data across the link, PPP encapsulates data in a frame similar
to a high-level data link control (HDLC) frame (
Figure 2-3).
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